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| author | Matthew Pickering <matthewtpickering@gmail.com> | 2020-11-18 11:55:55 +0000 |
|---|---|---|
| committer | Matthew Pickering <matthewtpickering@gmail.com> | 2021-03-03 19:09:34 +0000 |
| commit | a7aac008f69ca48e5ab3d4186fdcb3214c6e1463 (patch) | |
| tree | b41d57ca638eddfad54d9cfedf9b47c66106e34a /compiler/GHC/Driver/Session.hs | |
| parent | 4b297979d25740d31241a9000e36068db112545a (diff) | |
| download | haskell-a7aac008f69ca48e5ab3d4186fdcb3214c6e1463.tar.gz | |
Add option to give each usage of a data constructor its own info table
The `-fdistinct-constructor-tables` flag will generate a fresh info
table for the usage of any data constructor. This is useful for
debugging as now by inspecting the info table, you can determine which
usage of a constructor caused that allocation rather than the old
situation where the info table always mapped to the definition site of
the data constructor which is useless.
In conjunction with `-hi` and `-finfo-table-map` this gives a more fine
grained understanding of where constructor allocations arise from in a
program.
Diffstat (limited to 'compiler/GHC/Driver/Session.hs')
| -rw-r--r-- | compiler/GHC/Driver/Session.hs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/compiler/GHC/Driver/Session.hs b/compiler/GHC/Driver/Session.hs index 98c46427e6..8237525fb7 100644 --- a/compiler/GHC/Driver/Session.hs +++ b/compiler/GHC/Driver/Session.hs @@ -2775,7 +2775,8 @@ dynamic_flags_deps = [ -- Caller-CC , make_ord_flag defGhcFlag "fprof-callers" (HasArg setCallerCcFilters) - + , make_ord_flag defGhcFlag "fdistinct-constructor-tables" + (NoArg (setGeneralFlag Opt_DistinctConstructorTables)) , make_ord_flag defGhcFlag "finfo-table-map" (NoArg (setGeneralFlag Opt_InfoTableMap)) ------ Compiler flags ----------------------------------------------- |